摘要
利用选区激光熔化(SLM)技术,在不同的激光能量密度条件下制备了316L不锈钢薄片,对比研究了试样的拉伸性能和拉伸过程中微观组织的变化规律;分析了能量密度对试样拉伸性能的内在影响机制,阐明了能量密度区间的选择依据。结果表明,在合理的激光能量密度范围内,SLM成型试样的综合拉伸性能最佳;在区间外,随着能量密度增加,拉伸强度逐渐提高、伸长率逐渐降低。在拉伸过程中,断口附近的SLM组织逐渐演变为与拉伸方向近似平行的纤维状组织。
The 316L stainless steel sheets were prepared by selective laser melting(SLM)technique under different laser energy densities.The tensile properties and microstructure of the samples were compared and studied.The internal influence mechanism of the energy density on the tensile properties of the sample was analyzed,and the basis of selecting the energy density interval was clarified.The results show that the composite tensile properties of SLM molded samples are the best in the reasonable range of laser energy density.Outside the interval,the tensile strength increases and the elongation decreases with the increase of energy density.During the tensile process,the SLM structure near the fracture gradually evolves into a fibrous structure approximately parallel to the tensile direction.
作者
王泽荫
岳武
张昊
张映梅
薛诚
李晶
WANG Zeyin;YUE Wu;ZHANG Hao;ZHANG Yingmei;XUE Cheng;LI Jing(Department of Intelligent Control,Gansu Institute of Mechanical&Electrical Engineering,Tianshui 741000,China;School of Materials Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;Department of Mechanical Engineering,Gansu Institute of Mechanical&Electrical Engineering,Tianshui 741000,China)
出处
《铸造技术》
CAS
2021年第7期584-588,共5页
Foundry Technology
基金
国家自然科学基金(51565024)
2020年度甘肃省省级重点人才项目-机械装备绿色再造表面工程创新人才团队建设项目
甘肃省高等学校产业支撑项目(2020C-3)
兰州工业学院“开物”科研创新团队支持计划(2018KW-05)。
关键词
选区激光熔化成型
316L不锈钢
能量密度
拉伸性能
组织演变
selective laser melting(SLM)forming
316L stainless steel
laser density
tensile properties
microstructure evolution
